<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        a[target="_blank"]{
            color: red;
        }
    </style>
    <!--
       基础选择器:
       1.全局选择器:*{}
       2.元素选择器:div{}
       3.类选择器: .className{}
       4.id选择器: #idName{}
       5.属性选择器: [attrName]{}
       6.伪类选择器: a:hover{}
       7.伪元素选择器: div::before{}
     -->
</head>
<body>
    <a href="#" target="_blank">百度一下</a>
    <a href="#" target="_bule">百度一下</a>
</body>
</html>